The Civil War was not about slavery.
Had it had been, the South would have had no reason not to accept Lincoln’s bribe of the Corwin Amendment
This amendment, passed by the 36th Congress, 2nd Session, on March 2, 1861, in the form of a House (Joint) Resolution No. 80. It forbid subsequent attempts to amend the Constitution to empower the Congress to “abolish or interfere” with the “domestic institutions” of the states, including “persons held to labor or service”. In other words, it would have FOREVER protected slavery. The purpose was to motivate the southern states to not seccede.
This offering from the administration was rejected because the devisive issue was unfair tariffs, not slavery. The South was paying from 75% to 85% of the U.S. government revenues. Lincoln invaded the South to force them back into the union so he would not lose his tariffs. He did it “to preserve the union”. The reality that he was not preserving was that the remaining part of the United States was not generating enough revenue for the government to survive on by itself, there being no income tax at the time.
Without the south, he was soon to be out of a job.
Sort of the same situation that the current adminstration is in with the remaining taxpayers.
Which is why the idea of anyone trying to leave now would never be allowed. Once people realize that, it may take a wall to keep people in.